Keithley 6514, Instruction Manual

Page: 154 / 334

11-8 Digital I/O, Analog Outputs, and External Feedback
Preamp out
The preamp output of Model 6514 follows the signal amplitude applied to the input terminal
The preamp output provides a guard output for volts measurements. It can be used as an invert-
ing output or with external feedback in the amps and coulombs modes. Connections and equiv-
alent circuits for the preamp output are shown in Figure 11-6. Full-range outputs for the various
functions and ranges are listed in Table 11-3.
Model 1683
Test Lead kit
RS232 DIGITAL I/O
PREAMP
250V PK
2V
OUTPUT
COMMON CHASSIS
120
FUSE LINE
630mA
LINE RATING
50, 60Hz
60 VA MAX
T
(SB)
100 VAC
120 VAC
315mAT
(SB)
220 VAC
240 VAC
INPUT 250V PK
IEEE-488
(CHANGE IEEE
WITH FRONT PANEL MENU)
TRIGGER LINK
!
!
MADE IN
U.S.A.
V, GUARD
(PROGRAMMABLE)
OFF ON
GUARD
(FOLLOWS
INPUT)
(INTERNAL)
INPUT PREAMP
10K
PREAMP
OUT
2V
OUTPUT
COM
Fuse
Model 6514 Rear Panel
R
L
= Input Resistance of
measuring device
Input from
Prescaler
COM
S
+
-
S
0.1
Ω
10k Ω
Model6514A
Measuring Device
(i.e. Chart recorder)
2V Analog Output
A. Connections
LO
HI
B. Equivalent Circuit
Figure 11-5
Typical 2V
analog output
connections