Linking Voltage
Measurements
To link channels to the voltage conversion send the
[SENSe:]FUNCtion:VOLTage[:DC] [<
range
>,](@<
ch_list
>)
command.
•
The
<
ch_list
>
parameter specifies which channels to link to the
voltage EU conversion.
•
The optional
<
range
>
parameter can be used to choose a fixed A/D
range. Valid values are:
0
, .
0625
,
.25
,
1
,
4
,
16
, or
AUTO
. When not
specified or set to zero, the module uses autorange.
To set channels 0 through 15 to measure voltage using autorange:
SENS:FUNC:VOLT:DC 0,(@100:115)
0 for range means autorange.
To set channels 16 and 24 to the 16 volt range, and 32 through 47 to the
.625 volt range:
SENS:FUNC:VOLT:DC 16,(@116,124)
SENS:FUNC:VOLT:DC .625,(@132:147)
Must send a command per range.
or to send both commands in a single command message:
SENS:FUNC:VOLT:DC 16,(@116,124);VOLT .625,(@123:147)
Note
When using manual range in combination with amplifier SCPs, the EU
conversion will try to return readings which reflect the value of the input
signal. However, it is up to you to choose range values that will provide
good measurement performance (avoiding over-ranges and selecting ranges
that provide good resolution based on the input signal). In general,
measurements can be made at full speed using autorange. Autorange will
choose the optimum A/D range for the amplified signal level.
Linking Resistance
Measurements
To link channels to the resistance EU conversion send the
[SENSe:]FUNCtion:RESistance <
excite_current
>,[<
range
>,](@<
ch_list
>)
command.
Resistance measurements assume that there is at least one Current Source
SCP installed (eight current sources per SCP). See Figure 3-2.
•
The
<
excite_current
>
parameter is used only to tell the EU
conversion what the Current Source SCP channel is now set to.
Excite_current is specified in ADC and the choices for the HP E1505
Current Source SCP are
30e-6
(or
MIN
) and
488e-6
(or
MAX
). Select
488
µ
A for measuring resistances of less than 8,000 Ohms. Select
30
µ
A for resistances of 8,000 Ohms and above.
Chapter 3
Using the HP E1313/E1413 73
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