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Page 39

16.2

Command List

This section lists all the commands and queries implemented in this instrument. All numeric
parameters are shown as

<NRF>

and may be sent as

<NR1>

,

<NR2>

or

<NR3>

as described above.

16.2.1

General Commands

READ?

Returns the next reading from the main display immediately after the
command has been parsed.

The syntax of the response is:

<ASCII data><RMT>

Where

<ASCII data>

is a character string divided into 11-character plus up to

8-character fields. The first field is the measurement value and consists of
the following:

Digit 1: space (for positive values) or a minus sign.

Digits 2 to 8: a 6 digit number plus decimal point in the format of the range
selected for the measurement.

Digits 9 to 11: the exponent in the form e00, e-3, e03, etc., i.e. engineering
units.

Any overload reading (i.e. > 120,000 counts) is returned as ‘OVLOAD’. A
calculation overflow (relevant to some function results) is returned as
‘OVFLOW’.

The second field is the unit indication and will be one of the following:

V DC

V AC

V AC+DC

A DC

A AC

A AC+DC

Hz

Ohms

F (Farads)

V (Diode test)

C (Celsius)

F (Fahrenheit)

dB

W

VA

%

Examples:

101.234e-3 V DC (101.234mV)

-10.0012e00 V DC (-10.0012V)

00.1234e00 V AC+DC (0.1234V)

100.01e03 Hz (100.01kHz)

01.010e-6 F (1.01µF)

READ2?

Returns the readings from the secondary display immediately after the
command has been parsed. Then syntax is as for READ? Described above.
If the secondary display is currently showing the range of the main (primary)
display the response will be RANGE.

MODE?

Returns the state of the main display, including the mode, range and
whether the range is locked (manual) or autoranging.

The syntax of the response is:

<ASCII data>,<ASCII data>,<ASCII data>,<RMT>

The response includes three ASCII data fields.

The first field contains the primary display Mode which includes:

VDC, VAC, V AC+DC, IDC, IAC, IAC+DC, OHMS, DIODE, CONT, FREQ,
CAP, TEMPC, TEMPF.

The second field contains the range e.g. 1000mV.
The third and final field contains the range selection state either ‘MAN’ for
manual range, or ‘AUTO’ for autoranging.

Each of the ASCII fields is separated by a comma.

«
...
38
39
40
41
42
...
»

Содержание 1908 Series

Страница 1: ...Ireland Lambda Photometrics Limited Lambda House Batford Mill Harpenden Herts AL5 5BZ United Kingdom E info lambdaphoto co uk W www lambdaphoto co uk T 44 0 1582 764334 F 44 0 1582 712084 Characterisation Measurement Analysis ...

Страница 2: ... 2 3 AC Inlet 11 5 2 4 Protective Earth Terminal 11 6 Making Basic Measurements 12 6 1 Scale Length 12 6 2 Measurement Parameter Selection 12 6 3 Measurement Range Selection 12 6 4 Making Voltage Measurements 13 6 5 Making Current Measurements 13 6 6 Making Resistance Measurements 13 6 6 1 Two Wire Measurements 13 6 6 2 Four Wire Measurements 14 6 7 Making Continuity and Diode Checks 14 6 7 1 Cont...

Страница 3: ...p the Logger 23 11 2 Running the Logger 24 11 3 Starting and Stopping the Logger 24 11 4 Recalling Logger Readings 24 11 5 Clearing Logger Readings 24 12 The Utilities Menu 25 12 1 Beep Sound BEEp 25 12 2 Measurement Speed SPEEd 25 12 3 Measurement Filter FiLt 25 12 4 External Trigger E tr 25 12 5 Battery Condition bAtt 25 12 6 dB Reference Impedance db rEF 25 12 7 Temperature Probe Setup rtd 26 1...

Страница 4: ...atus Byte Register STB and GPIB Service Request Enable Register SRE 34 15 5 GPIB Parallel Poll PRE 35 15 6 Query Error Register GPIB IEEE Std 488 2 Error Handling 35 15 7 Power on Settings 35 15 8 1908 Status Model 36 15 9 Register Summary 36 16 Remote Commands 37 16 1 General 37 16 1 1 Remote and Local Operation 37 16 1 2 Remote Command Handling 37 16 1 3 Remote Command Formats 37 16 1 4 Command ...

Страница 5: ...l x Selectable measurement speed x Touch hold mode holds onto a stable reading until updated x 500 point data logger with timer x Temperature measurement for PT100 or PT1000 sensors x Measurement post processing to give dB and power measurement with settable reference impedances percentage deviation from a user entered reference linear scaling with offset limits comparison for go no go testing aut...

Страница 6: ... It may occasionally be subjected to temperatures between 5 and 10 C without degradation of its safety It has been designed for measurement use to 1000VDC 750VACrms in circuits isolated from AC mains power derived secondary circuits within an equipment with occasional transient over voltages up to 1500Vpeak It can also be used for CAT II Measurement Category II use to 600VDC ACrms and CAT III use ...

Страница 7: ... may damage the meter Protective Earth terminal CAT II Measurement Category II Inputs may be connected to AC mains power under Category II overvoltage conditions direct current alternating current CAT III Measurement Category III Inputs may be connected to AC mains power under Category III overvoltage conditions Standby supply Instrument is not disconnected from AC mains power when switch is off ...

Страница 8: ...ting or damaging the PCB assembly take care not to touch any components other than the two shorting connectors described in the next step 4 Remove the shorting connector in position PJ4 on the PCB beside the mains transformer TX1 and replace it with the alternative shorting connector from the parking position PJ8 align pin1 of the connector with the pin 1 corner marker of the header Park the unuse...

Страница 9: ...ohibited 3 3 Mounting This instrument is suitable both for bench use and rack mounting It is delivered with soft protective front and rear bezels which have integral moulded feet this is the most suitable configuration for bench use For rack mounting the protective bezels and handle stand can be removed such that the instrument can be fitted beside any other standard 2U half rack instrument in a 1...

Страница 10: ...power is connected and a yellow LED is illuminated whilst charging is taking place Battery Life from fully charged is approximately 20 hours with the backlight on and up to 35 hours with the backlight off Under battery operation a battery symbol will appear on the display if the charge level falls below about 10 The approximate charge level can be checked from the Utilities menu see section 12 5 F...

Страница 11: ...ion of normal operation may require replacement of protection devices e g current range fuses The input impedance between INPUT HI and INPUT LO is nominally 10M on dc ranges and 1M on ac ranges The black LO socket is considered less positive than the red socket The maximum voltage that can be applied between HI LO is 1000Vdc 750Vrms 1000Vpeak The sockets are rated to 600V CAT II 300V CAT III The m...

Страница 12: ...ive see Installation section 3 2 When the power lead is connected this lead provides the necessary protective earth connection to an external protective earth system 5 2 4 Protective Earth Terminal For battery only operation without an AC power lead connected the M4 threaded chassis connection marked must be connected to an external protective earth system via a green yellow insulated cable with a...

Страница 13: ...meters marked in blue above certain keys are selected by first pressing SHIFT Whilst shift is operational a SHIFT symbol appears on the left side of the display See section 7 for full details 6 3 Measurement Range Selection Refer to the front panel diagram in section 5 1 and to the display diagram below When a parameter is first selected auto ranging is enabled and an AUTO symbol is displayed Pres...

Страница 14: ...ts up to 10A can be made using the 10A socket having manually ranged to 10A with ଢ଼ The 10mA 100mA and 1000mA ranges using the mA socket are protected by a 1 6A F HRC fuse The 10A range using the 10A socket is protected by a 10A F HRC fuse Both fuses are accessed via a panel on the base of the instrument The input test leads and AC power lead must be disconnected before opening the fuse access pane...

Страница 15: ... be selected and a current of approximately 1mA to flow out of the INPUT HI socket With the anode of the diode connected to this terminal the diode forward voltage will be shown Reverse diode connection will show OFL 6 8 Making Frequency Measurements Pressing Hz selects frequency measurement Measurements are made using the INPUT HI and LO sockets within the yellow area of the panel Four ranges 100...

Страница 16: ...uit will be engaged the buzzer will sound and trIP will be displayed After completion of the trip event the measurement mode is set to Vdc to show the over voltage that is being applied to the input sockets BIT 0 of the Input Trip Register ITR is set to 1 over voltage protect see section 15 1 6 11 Measurement Hold Hold operates only on the primary display Pressing Hold causes the measurement to be...

Страница 17: ... 600 but a different value can be selected within the Utilities menu Press Utilities use the Navigator keys to select rEF and confirm with OK The existing reference value will flash Alternative values can be selected using the Navigator keys and confirmed with OK Available values are 50 75 93 110 124 125 135 150 250 300 500 600 900 1000 1200 and 8000 Pressing Shift followed by Auto Clear is the sh...

Страница 18: ... auto range modes it is cancelled by pressing T Hold again Shift Hold or by changing the measurement parameter or range 7 6 Measurement Speed and Measurement Filter The normal measurement speed is 4 readings sec for most single measurement parameters For voltage current and resistance measurements the speed can be increased to 20 readings sec at the expense of resolution which reduces to 12 000 co...

Страница 19: ...y are being used no secondary display can be set The secondary measurement with the exception of the 10A current ranges always auto ranges The 10A current ranges are set by first selecting the function 2nd followed by Iac or Idc then pressing 2nd followed by ଢ଼ To return to the mA measurement select 2nd followed by v However if both main and secondary displays are making current measurements the ra...

Страница 20: ... As discussed at the beginning of this section the reading update rate is reduced in Dual Measurement Mode because the two readings are made alternately However the reading rate is not simply halved because enough time must be allowed for each measurement to fully settle to the different conditions before the display is updated unless this is done neither display will reliably show the true measur...

Страница 21: ...r on the rear panel provides both an input and output signal 9 1 Trigger In Signal The trigger input I P connects to the LED of an opto isolator through a 1k resistor Apply 3V to set trigger input True maximum safe applied input is 10V The trigger input can be set to perform either of two actions as set from the Utilities menu see section 12 4 1 Hold measurement the measurement in progress at the ...

Страница 22: ...measurement parameter and range which must be selected before the function is selected To select Limits press Function and use the Navigator keys to choose Limits as the flashing symbol Confirm with OK the secondary display will flash the word run To view or edit the Limit values press the Navigator or key to select Edit and confirm with OK The existing High limit HI value will be displayed and ca...

Страница 23: ... most negative values that occur when the function is run and displays either in the secondary display simultaneously with the normal measurement in the main display To select Min Max press Function and use the Navigator keys to choose Min Max as the flashing symbols Confirm with OK the secondary display will flash the word run When running the maximum reading will be shown on the secondary displa...

Страница 24: ...ected for both voltage and current measurement see Making Voltage and Current Dual Measurements section 8 2 with Vdc or Vac selected for the main display To select VA press Function and use the Navigator keys to choose VA as the flashing symbol Confirm with OK the secondary display will flash the word run Pressing OK again will start the function running 11 Data Logging The logger function can sto...

Страница 25: ...eadings stored new readings will commence at the next available store number Note that all logging sources are OR ed so that the timer if active manual logging key trigger input or remote interface command can all cause a measurement to be stored 11 3 Starting and Stopping the Logger Logging can be paused by pressing Stop This returns the display to show a flashing run and logging can be resumed b...

Страница 26: ... condition is slow SLO Note that Continuity measurements are always made at the higher speed The measurement speed is indicated by a flashing asterisk symbol on the left of the display see section 12 10 12 3 Measurement Filter FiLt In order to minimise jitter for sensitive measurements of DC volts and Resistance an analogue filter is incorporated that provides high rejection of 50Hz or 60Hz noise ...

Страница 27: ... power is disconnected There are situations where the instrument should remain on operating under battery power when the AC power is disconnected e g when logging readings over an extended period for these the Auto or Battery settings will be more appropriate With AC OFF set to Auto AUtO the instrument is restored to its previous state prior to power down on or standby when AC power is applied but...

Страница 28: ...n with the Service Guide 13 2 Hard Reset If the multimeter gets into a condition in which normal operation is not possible it can be returned to normal operation by reloading the Factory Default settings see section 12 8 However if it locks up i e will not respond to key presses it can be put through a Hard Reset A Hard Reset is performed by holding down both the Cancel and Stop keys together for ...

Страница 29: ...ened with water or a mild detergent Polish the display window with a soft dry cloth WARNING TO AVOID ELECTRIC SHOCK OR DAMAGE TO THE METER NEVER ALLOW WATER TO GET INSIDE THE CASE TO AVOID DAMAGE TO THE CASE OR DISPLAY WINDOW NEVER CLEAN WITH SOLVENTS 13 5 Firmware Updates The instrument firmware can be updated in the field through the USB port It requires a PC software utility provided by the man...

Страница 30: ... the instrument rear panel The pin connections are as specified in IEEE Std 488 1 1987 and the instrument complies with both IEEE Std 488 1 1987 and IEEE Std 488 2 1987 It provides full talker listener service request serial poll and parallel poll capabilities There are no device trigger or controller capabilities The IEEE Std 488 1 interface subsets provided are SH1 AH1 T6 L4 SR1 RL2 PP1 DC1 DT0 ...

Страница 31: ...in Device Manager as not working properly If this happens select this device right click and choose update driver software and then browse this computer for driver software and then locate the INF file on the CD as described above Once Windows has installed the device driver it will assign a COM port number to this particular unit This number will depend on previous COM port assignments on this PC...

Страница 32: ... below 14 4 2 mDNS and DNS SD Support The instrument supports these multicast name resolution protocols which allow a meaningful host name to be assigned to the unit without needing an entry in the database of a central nameserver The desired hostname can be entered on the webpage which will have to be accessed by IP address the first time spaces are not allowed The name then appears in the local ...

Страница 33: ...of TCPIP0 192 168 0 100 inst0 INSTR but for this instrument the name must be modified to read TCPIP0 192 168 0 100 9221 SOCKET where 9221 is the TCP port used by this instrument for control and monitoring see below 14 4 9 XML Identification Document URL As required by the LXI standard the instrument provides an XML identification document that can be queried via a GET at http IPaddress 80 lxi iden...

Страница 34: ...O terminals in the following modes Ohms 4 wire and 2 wire Diode Continuity Capacitance and Temperature measurement The bits in the Input Trip register are set when the event they report occurs and then remain set until read by the ITR query After the Response Message is sent any bits reporting conditions that no longer apply will be cleared any bit reporting a condition that remains true will rema...

Страница 35: ...e Standard Event Status Register will be set This bit can be masked from any further consequences by clearing bit 4 of the Standard Event Status Enable Register 15 4 Status Byte Register STB and GPIB Service Request Enable Register SRE These two registers are implemented as required by the IEEE Std 488 2 Any bits set in the Status Byte Register which correspond to bits set in the Service Request E...

Страница 36: ...et in the Standard Event Status Register a value of 3 to be placed in the Query Error Register and the parser to be reset The IEEE 488 2 DEADLOCK error arises if the response formatter is waiting to send a response message and the input queue becomes full This will cause the Query Error bit to be set in the Standard Event Status Register a value of 2 to be placed in the Query Error Register and th...

Страница 37: ...egister EER Execution Error Register QER Query Error Register ESR Standard Event Status Register ESE ESE Standard Event Status Enable Register STB Status Byte Register SRE SRE Status Byte Enable Register PRE PRE Parallel Poll Response Enable Register These registers are cleared after being queried or by the CLS command ...

Страница 38: ...erface the response formatter will wait indefinitely if necessary until the complete response message has been read by the controller before the parser is allowed to start the next command in the input queue On all other interfaces the response message is immediately sent into buffers in the physical layer 16 1 3 Remote Command Formats Commands are sent as PROGRAM MESSAGES by the controller each c...

Страница 39: ...e return character 0DH followed by the new line character 0AH with in the case of GPIB only the END message NL END This is shown as RMT in the descriptions below Each query produces a specific RESPONSE MESSAGE which is described in the entry for the query command in the remote commands list below Most responses consist of a keyword followed by either text or a number in one of the following format...

Страница 40: ...field is the unit indication and will be one of the following V DC V AC V AC DC A DC A AC A AC DC Hz Ohms F Farads V Diode test C Celsius F Fahrenheit dB W VA Examples 101 234e 3 V DC 101 234mV 10 0012e00 V DC 10 0012V 00 1234e00 V AC DC 0 1234V 100 01e03 Hz 100 01kHz 01 010e 6 F 1 01µF READ2 Returns the readings from the secondary display immediately after the command has been parsed Then syntax ...

Страница 41: ...g speed SLOW sets the sampling speed to 4SPS FAST sets the sampling speed to 20SPS RTD CPD Sets the RTD temperature measurement connection to either 2 wire or 4 wire The following CPD can be used to set the connection 2W sets the measurement connection to 2 wire 4W sets the measurement connection to 4 wire 16 2 2 Main Display Commands VDC CPD Sets the main display to dc Volts and optionally sets t...

Страница 42: ...ge The following CPD can be used to set the range 100 1000 10K 100K 1000K 10M CONT Sets the main display to continuity test DIODE Sets the main display to diode test TEMPC CPD Sets the main display to Celsius temperature measurement and optionally sets the RTD probe type if no probe is specified the existing probe is used The following CPD can be used to set the RTD probe type PT100 PT1000 TEMPF C...

Страница 43: ...e FREQ2 Sets the secondary display to frequency autoranging VAC or IAC must first have been selected in the main display 16 2 4 First Level Modifier Commands NULL Nulls the main display and sets it to manual i e the current range is held The un nulled reading will be shown in the secondary display if the meter is not in dual measurement mode except for capacitance NULLOFF Cancels Null operation HO...

Страница 44: ...nd Max to the same value If Min Max mode is already running Min and Max are reset to the same value and recording starts again MM Returns the recorded Min and Max values The syntax of the response is ASCII data for Min ASCII data for Max RMT Where each ASCII data is a character string divided into two fields value followed by units exactly as for the standard READ response see that command section...

Страница 45: ...gger or by remote command TRIG see below LOG Returns the contents of all valid locations in the data logger store starting at location 001 The syntax of the response is ASCII data RMT Where ASCII data consists of up to 500 complete results separated by commas each result comprising three fields The first filed is the reading number consisting of 3 digits followed by three spaces The following two ...

Страница 46: ...bility The command is ignored in this instrument 16 2 8 Status Commands CLS Clear Status Clears all status indications including the Status Byte Does not clear any Enable Registers ITR Query the Input Trip Register The response format is NR1 RMT Clears any bits that no longer apply ITE NRF Set the Input Trip Enable Register to NRF ITE Returns the value in the value in the Input Status Enable Regis...

Страница 47: ...y the parameters to be used by the LAN interface Note a power cycle is required after these commands are sent before the new settings are used or returned in response to the queries listed above The instrument does not attempt to check the validity of the IP address or netmask in way other than checking that each part fits in 8 bits The rear panel LAN reset switch will override these commands and ...

Страница 48: ... level modifiers cancelled Ax b factors set to A 1 0000 and b 00000 Limits set to 0 0000 Delta reference set to 10000 dB reference impedance set to 600 Watts reference impedance set to 50 Data logger set to Off and timer set to 0000 seconds logger store contents preserved External Trigger set to Off Speed set to slow 4 readings sec Measurement update symbol star set to On Beep sound set to Off Mea...

Страница 49: ...nt and click interface arranged similarly to the actual instrument Measurement function can be selected for both the main and secondary displays together with the measurement range The display includes an analog bar graph with minimum and maximum reading markers A logger function enables both measurements to be recorded at set time intervals and displayed in both graphical and tabular views The lo...

Страница 50: ...d the analogue 50 60Hz rejection filter is enabled AC Volts True RMS Range Accuracy Resolution 45Hz 10kHz 10kHz 30kHz 30kHz 50kHz 100mV 0 2 150 dig 1 5 200 dig 1µV 1000mV 0 2 100 dig 0 5 100 dig 2 200 dig 10µV 10V 0 2 100 dig 0 5 100 dig 2 200 dig 100uV 100V 0 2 100 dig 0 5 100 dig 2 200 dig 1mV 750V 0 2 100 dig 0 5 100 dig 2 200 dig 10mV Accuracy specifications apply for readings between 10 000 a...

Страница 51: ...V fuse protected Typical Voltage Burden 10mA range 100mV 10A 1A and 100mA ranges 600mV AC Current True RMS Range Accuracy 45Hz 10kHz Resolution 10mA 0 35 20 dig 100nA 100mA 0 35 20 dig 1uA 1A 0 5 20 dig 10uA 10A 0 5 20 dig to 5A 100uA 10A 1 20 dig to 10A 100uA Accuracy specifications apply for readings between 10 000 and 120 000 counts Additional error at crest factory 3 typically 0 5 Maximum Inpu...

Страница 52: ...ge Accuracy Resolution PT100 50 to 400 C 0 05 0 5 C 0 1 C PT1000 50 to 400 C 0 05 0 5 C 0 1 C Accuracy specifications apply to multimeter only they do not account for additional probe accuracy errors Continuity and Diode Test Continuity 1000 range selected audible tone sounds for impedance 10 Diode Test Test current approximately 1mA displays voltages up to 1 2V Maximum Open Circuit Voltage 3 5V M...

Страница 53: ...th offset Limits Reading displayed with HI LO or PASS with respect to user defined high and low limits Min Max Minimum and maximum reading stored Power Calculates V2 R and displays in Watts with respect to a user defined impedance VA Calculates and displays Volts x Amps Data Logger Manual or automatic storage of 500 measurements Storage interval 1s to 9999s or at the measurement sample rate manual...

Страница 54: ...ion Degree 2 Safety EMC Complies with EN61010 1 EN61010 2 030 EN61010 2 033 EN61326 1 For details request the EU Declaration of Conformity for this instrument via http www aimtti com support serial no needed Size 250 W x 97 H x 295 D mm in bench top configuration 213 5 W x 86 5 H x 269 D mm 2U rack in rack mount format Weight 3 2kg ...

Страница 55: ...nts and Thurlby Thandar Instruments Distribution in the UK Ireland Lambda Photometrics Limited Lambda House Batford Mill Harpenden Herts AL5 5BZ United Kingdom E info lambdaphoto co uk W www lambdaphoto co uk T 44 0 1582 764334 F 44 0 1582 712084 ...

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