Advertisement
Model 4277A
SECTION IV
4-15.
QPEN/SHQRT TEST
4-16.
This test checks that the Zero Offset function is operating correctly.
OPEN
(a)
c:
i/.
.m\\.
SHORT
(b)
Figure 4-4. Open/Short Test Setups.
EQUIPMENT:
Terminations
Open (OS)
Short
HP 16074A
Standard Resistor
Set
PROCEDURE:
1. Connect Open (OS) termination directly to the 4277A UNKNOWN terminals as
shown in Figure 4-4 (a).
2. Set the 4277A's controls as follows:
DISPLAY A function . C
DISPLAY B function . ESR/G
Test Frequency . lOkHz
C RANGE . InF
TEST SIG LEVEL . HIGH
CIRCUIT MODE . AUTO
MEAS SPEED . MED
TRIGGER . INT
CABLE LENGTH switch . 0
DC BIAS switch . OFF
3. Press the ZERO OPEN button to perform "open" offset adjustment and wait
approximately 10 seconds. (Offset values are displayed on both DISPLAY A and
B.)
4. The values displayed on the 4277A should be within the following test limits;
DISPLAY A: 0±0.0008nF
DISPLAY B: 0±0.07i£
5. Set the TEST SIG LEVEL and test frequency in accordance with Table 4-6 (a).
The values displayed on the 4277A should be within the test limits given in the
table.
4-11
Advertisement
