Keithley 7017, Instruction Manual

Page: 27 / 43

Servicing
4-2
4.3.1 Environmental conditions
All performance verification measurements should be made
at an ambient temperature of 18
°
C to 28
°
C and <70% rela-
tive humidity.
4.3.2 Recommended verification equipment
Table 4-1 summarizes the test equipment recommended for
performance verification. Alternate equipment may be used
as long as the corresponding specifications are at least as
good as those listed.
4.3.3 Insertion loss tests
Insertion loss tests are performed by applying a 10MHz-
800MHz signal from a network analyzer to the Model 7017
channel inputs and then measuring the amount of attenuation
as the signal passes through the card.
Perform the following steps:
Table 4-1
Recommended verification equipment
Description
Manufacturer
and Model
Specifications Test
Network
Analyzer
Test Set
Cable Set
Electrometer HP8754A
HP8753C
HP11851
Keithley 6517
10MHz-800MHz
1G
Ω
,
±
0.226%
Insertion
loss
Isolation
1. Set the network analyzer to sweep the 10MHz to
800MHz frequency range.
2. Normalize the analyzer reference channel to 0dB on the
display.
3. Connect the network analyzer to the Model 7017 as
shown in Figure 4-1. Be sure to use 50
Ω
cables and set
up for all insertion loss tests.
4. Install the Model 7017 in the Model 7001 or 7002 main-
frame.
5. Close channel 1 on the Model 7017 card.
6. Verify that the insertion loss values are within the limits
shown in Table 4-2.
7. Open the closed channel.
8. Repeat steps 3 through 7 for channels 2 through 8. For
each channel:
• Connect the analyzer signal to the input jack of the
channel being tested.
• Be sure the signal output cable is connected to the
correct output jack.
• Close only the channel being tested.
• Verify that the insertion loss values at the various fre-
quencies are within the limits stated in Table 4-2.
Table 4-2
Insertion loss values
Frequency Insertion loss
10MHz
100MHz
500MHz
800MHz <0.35dB
<1dB
<2dB
<3dB