4-6
Range, Units, Digits, Rate, and Filters
Model 6485 Picoammeter Instruction Manual
The rate setting is global for all ranges. Therefore, it does not matter what range is pres-
ently selected when you set rate.
There are two ways to set rate. You can select slow, medium, or fast by using the RATE
key, or you can set the number of power cycles from the NPLC menu that is accessed by
pressing CONFIG / LOCAL (while in LOCAL) and then RATE.
:Rate Key
— The RATE key selections are explained as follows:
•
SLOW
— Selects the slowest preset integration time (6 PLC for 60Hz or 5 PLC for
50Hz). The SLOW rate provides better noise performance at the expense of speed.
•
MED
— Selects the medium integration time (1 PLC). Select the MED rate when
a compromise between noise performance and speed is acceptable.
•
FAST
— Selects the fastest preset integration time (0.1 PLC). Select the FAST rate if
speed is of primary importance (at the expense of increased reading noise).
To change the rate setting, press (and release) the RATE key until the desired rate annunci-
ator (SLOW, MED or FAST) is displayed.
NPLC Menu
— From this menu you can set rate by setting the PLC value. Perform the
following steps to set NPLC:
1.
Press CONFIG / LOCAL and then RATE to display the present PLC value.
2.
Use the
,
,
, and
keys to adjust to the desired PLC value. Valid values are:
60Hz operation: 0.01 to 60
50Hz operation: 0.01 to 50
3.
Press ENTER.
NOTE
The SLOW, MED, or FAST annunciator will only turn on if the set PLC value
corresponds exactly to the slow (5 or 6 PLC for the respective frequency of 50 or
60Hz), medium (1 PLC) or fast (0.1 PLC) integration rate. For example, with the
integration rate set to 2 PLC, none of the rate annunciators will turn on.
SCPI programming — rate
contains the path and the command to set rate.
Table 4-4
SCPI commands — rate
Command
Description
Default
[:SENSe]
[:CURRent]
:NPLCycles <n>
SENSe Subsystem:
Specify integration rate; 0.01 (PLCs)
to 6.0 (60Hz) or 5.0 (50Hz)
6.0 (60Hz)
5.0 (50Hz)
Summary of Contents for 6485
Page 20: ......
Page 24: ......
Page 44: ...1 20 Getting Started Model 6485 Picoammeter Instruction Manual ...
Page 66: ...3 6 Measurements Model 6485 Picoammeter Instruction Manual ...
Page 138: ...9 20 Remote Operation Model 6485 Picoammeter Instruction Manual ...
Page 159: ...11 CommonCommands ...
Page 164: ...11 6 Common Commands Model 6485 Picoammeter Instruction Manual ...
Page 165: ...12 SCPISignalOriented MeasurementCommands ...
Page 190: ...14 12 SCPI Reference Tables Model 6485 Picoammeter Instruction Manual ...
Page 214: ...16 14 Calibration Model 6485 Instruction Manual ...
Page 219: ...A Specifications ...
Page 221: ...B StatusandErrorMessages ...
Page 227: ...C GeneralMeasurement Considerations ...
Page 233: ...D DDCEmulationCommands ...
Page 247: ...E ExamplePrograms ...
Page 250: ...E 4 Example Programs Model 6485 Picoammeter Instruction Manual ...
Page 251: ...F IEEE 488BusOverview ...
Page 266: ...F 16 IEEE 488 Bus Overview Model 6485 Picoammeter Instruction Manual ...
Page 267: ...G IEEE 488andSCPI ConformanceInformation ...
Page 311: ......