Keithley 6487 Reference Manual

7-12 Triggering Model 6487 Reference Manual
External triggering
Input and output triggers are received and sent via the rear panel TRIGGER LINK connec-
tor. The trigger link has six lines. At the factory line #2 is selected for output triggers and
line #1 is selected for input triggers. These input/output assignments can be changed as
previously explained in this section. The connector pinout is shown in Figure 7-4.
Figure 7-4
Trigger link connection operation
Input trigger requirements
An input trigger is used to satisfy event detection for a trigger model layer that is using the
TLINK control source. The input requires a falling-edge, TTL-compatible pulse with the
specifications shown in Figure 7-5.
Figure 7-5
Trigger link input pulse specifications
876
54
3
21
Rear Panel Pinout
Pin Number
Description
1
2
3
4
5
6
7
8
Trigger Link 1
Trigger Link 2
Trigger Link 3
Trigger Link 4
Trigger Link 5
Trigger Link 6
Ground
Ground
Trigger Link
Triggers on
Leading Edge
TTL High
(2V-5V)
TTL Low
(
<0.8V)
2 μs
Minimum

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%