Keithley 6487 User Manual

3-14 Measurements and Sourcing Voltage Model 6485 and 6487 User’s Manual
Open interlock indication
If the interlock is asserted (opened) while the unit is on the 50V or 500V range, the voltage
source will also technically be in compliance. However, there will be no indication of that
status over the front panel or in the status registers. The open interlock takes precedence.
SCPI commands — voltage source
Table 3-7
SCPI commands — voltage source
Command Description
SOUR:VOLT <Voltage>
SOUR:VOLT:RANG <Range>
SOUR:VOLT:ILIM <Limit>
SOUR:VOLT:STAT <b>
SOUR:VOLT:INT <b>
SOUR:VOLT:INT:FAIL?
Set the source output level (-500 to +500V).
Set source range to one of three ranges: 10, 50, and 500V.
Set the source current limit: 2.5e-5, 2.5e-4, 2.5e-3, or 2.5e-2.
1
Enable (ON) or disable (OFF) source output.
Enable (ON) or disable (OFF) interlock for 10V range.
2
Query interlock state (1 = asserted); source output cannot be turned on.
1
2.5e-2 not available for 50V and 500V ranges.
2
See Section 2 for interlock operation.
Programming example — voltage
The following command sequence will output 5V on the 10V range with a 2.5mA limit:
*RST ' Return 6487 to GPIB defaults.
SOUR:VOLT:RANG 10 ' Select 10V source range.
SOUR:VOLT 5 ' Set voltage source output to 5.
SOUR:VOLT:ILIM 2.5e-3 ' Set current limit to 2.5mA.
SOUR:VOLT:STAT ON ' Put voltage source in operate.

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%