Keithley 6487 Reference Manual

Model 6487 Reference Manual Range, Units, Digits, Rate, and Filters 4-7
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.
klqb 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
Table 4-4 contains the path and the command to set rate.
Programming example — rate
The following command sets the integration rate for all measurement ranges to 2 PLC:
CURR:NPLC 2 ' Set integration rate to 2 PLC.
Table 4-4
SCPI commands — rate
Command Description Default
[:SENSe]
[:CURRent]
:NPLCycles <n>
SENSe Subsystem:
Specify integration rate: 0.01 (PLCs) to
60.0 (60Hz) or 50.0 (50Hz)
6.0 (60Hz)
5.0 (50Hz)

Keithley 6487 Specifications

General

Type	Picoammeter/Voltage Source
Current Measurement Range	20 fA to 20 mA
Interfaces	GPIB, RS-232
Voltage Burden	< 200 µV
Input Impedance	>10^14 Ω
Power	100 V / 120 V / 220 V / 240 V
Basic Current Measurement Accuracy	0.4%