Analog Output - Keithley 6485 User Manual

2-14 Connections
With Model 6487 front panel operation, an open interlock will display "CLOSE INTLCK"
as an error message when attempting to operate the voltage source on the 50V and 500V
ranges. The Model 6487 in the Model 487 DDC emulation mode displays "IDDCO
ERROR" on the front panel when an "O1" command is sent. The Model 487 displays
"INTERLOCK" for the same condition. The "U9" voltage source error status word func-
tions the same for either the Model 487 or Model 6487 in DDC emulation mode.

Analog output

The Model 6485/6487 has an analog output on the rear panel. The ANALOG OUT pro-
vides a scaled, inverting ±2V output. A full-scale reading corresponds to ±2V output.
CAUTION
Connections for using this output are shown in
(Model 6487). For a full-scale input (i.e. 2mA on the 2mA range), the output will be -2V.
The 2V analog output signal is not corrected during calibration. The Model 6485 output
impedance is 1kΩ, while the Model 6487 output impedance is <100Ω. To minimize the
effects of loading, the input impedance of the device connected to the ANALOG OUT
should be as high as possible.
Figure 2-14
Typical Model 6485 analog output connections
CAT I
INPUT
220V PK
Model 6485 Rear Panel
Connecting COMMON or ANALOG OUT to earth while floating the
input may damage the instrument.
MADE IN
U.S.A.
IEEE-488
ANALOG OUT (CHANGE IEEE ADDRESS
WITH FRONT PANEL MENU)
TRIGGER LINK RS-232
LINE RATING
50, 60Hz
!
30 VA
FUSE LINE
630mA T 100 VAC
(SB) 120 VAC
315mAT 220 VAC
(SB) 240 VAC
Model 6485 and 6487 User's Manual
Figure 2-14
LO
Test Lead
(Model 6485) and Figure 2-15
HI
Measuring Device
(i.e. Chart recorder)