117
Signametrics
6.1 Performance Tests
This test compares the performance of the SMX2040/44 with the specifications given in Section 2. The test is
recommended as an acceptance test when the instrument is first received, and as a verification after performing the
calibration procedure. To ensure proper performance, the test must be performed with the SMX2040 installed, with
the covers on. The ambient temperature must be between 18
°
C to 28
°
C. Allow the SMX2040 to warm up at least
one-half hour before performing any of the tests. The default reading rate of the SMX2040 should be used in each
test.
6.2 DC Voltage Test
The following procedure may be used to verify the accuracy of the DCV function:
1. If you have not done so, install the SMX2040. Ensure that the chassis has been on for at least one-half hour, with
all covers on, before conducting this test.
2. Apply a high quality copper wire short to the SMX2040
V,
Ω
+ & -
inputs. Select the DCV function, Autorange.
Allow the SMX2040 to settle for several seconds, and perform the
Relative
function.
3. Apply the following DC voltages to the
V,
Ω
+ & -
terminals. Check to see that the displayed reading on the
SMX2040 is within the indicated range.
T
Voltage Test
ep
mum Reading
um Reading
able 9-2. DC
St
Range
Input
Mini
Maxim
1
330 mV
0V (short)
-8
µ
V
+8
µ
V
2
330 mV
190 mV
189.9787mV
190.0213 mV
3
330 mV
-190 mV
-190.0213 mV
–189.9787 mV
4
3.3 V
1.9 V
1.899898 V
1.900102 V
5
3.3 V
-1.9 V
-1.900102 V
-1.899898 V
6
33 V
19 V
18.99834 V
19.00166 V
7
33 V
-19 V
-19.00166 V
-18.99834 V
8
330 V
190 V
189.9833 V
190.0167 V
9
330 V
-190 V
-190.0167 V
-189.9833 V
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