Keithley 6487 Reference Manual

Model 6487 Reference Manual Limit Tests and Digital I/O 8-19
A) :FEED <name>
Name parameters:
• CALCulate1 — Limit tests will be performed on the result of a math calculation
(mX+b, m/x+b, or log).
• SENSe — Limit tests will be performed on the input signal. Note however, that Rel
can be used on the result of a math calculation as well as the input signal. Limit
tests will be performed on the result of the Rel operation (see CALCulate1:NULL).
Details on relative, mX+b, m/X+b, and log are provided in Section 5.
Command Description Default Ref
:SOURce2 SOURce2 Subsystem:
:TTL <NDN> or <NRf> Specify 4-bit digital output clear pattern. 15 B
:CLEar Clear I/O port (return output to TTL pattern):
[:IMMediate] Clear I/O port immediately.
:AUTO <b> Enable or disable auto-clear. OFF
:DELay <n> Specify delay (pulse-width) for pass/fail
pattern: 0 to 60 (sec).
0.0001
:TTL4 Line 4 Mode configuration:
:MODE <name> Select output line 4 mode: EOTest or BUSY. EOT
:BSTate <ttl> Select active TTL level for busy: 1 (HI) or 0 (LO). 0
Trigger Subystem: Sec 7
ARM Arm Layer:
:SOURce <name> Select control source: NSTest, PSTest, BSTest, or
IMMediate.
IMM E
INITiate Initiate one trigger cycle.
FORMat FORMat subsystem:
:SOURce2 <name> Select data format for reading output patterns:
<name> = ASCii Decimal format
HEXadecimal Hexadecimal format
OCTal Octal format
BINary Binary format
ASC
Table 8-3 (cont.)
Limit test commands

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%