Models 2500 and 2502 User’s Manual Basic Operation 3-3
Compliance
Each voltage bias source has a maximum output level of 100V @ 20mA. If the load resis-
tance is low enough so that the unit exceeds the 20mA current limit, the unit is considered
to be in compliance, and the corresponding source display field (Src1 or Src2) will blink.
See Section 5, “Bias source operating boundaries,” for more information. You can also use
compliance for limit testing (Section 10), and the unit can be programmed to generate an
SRQ under compliance conditions over the GPIB (Section 14).
Basic circuit configuration
The fundamental circuit configuration for the Model 2500 is shown in Figure 3-1. Note
that the unit has two separate channels (one channel shown), each of which includes a
feedback ammeter and a 0 ±10V or 0 ±100V voltage bias source. Figure 3-1 also shows
the output enable circuit, which is shown enabled (Section 12), and the ground connect
relay (see “Ground connect mode,” page 3-8). Note that the DUT is connected between
the triax INPUT jack and the SOURCE OUTPUT terminal.
Figure 3-1
Basic circuit configuration
-
+
Floating Channel 1 or
Channel 2 Common
Feedback Ammeter
To A/D
Converter
Bias Source
0 to ±10V or
0 to ±100V
20mA Max
SOURCE
OUTPUT
Triax
INPUT
20mA Max
Note: One channel shown.
Chassis
Ground
HI
LO
Ground
Connect
Chassis
Ground
Output
On
R
F
DUT
I
Other channel is identical.
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