14 34980A Service Guide
2 Specifications
Multiplexer Module Specifications and Characteristics (continued)
[1]
50 source, 50 load, differential measurements verified with 4-port network analyzer (Sdd21)
[2]
With in-rush resistors bypassed. Bypassing resistors reduces lifetime of relays. See the rated load relay life characteristics.
[3]
Speeds are for 4½ digits, delay 0, display off, autozero off, and within bank.
[4]
With 100 input protection resistors.
34921A 34922A 34923A 34924A 34925A
AC characteristics
Bandwidth at terminal block
[1]
45 MHz 25 MHz 45 MHz
[2]
/4
MHz
10 MHz 1-wire
25 MHz
[2]
/4
MHz
[4]
1 MHz
Crosstalk
at terminal block (ch-ch)
[1]
300 kHz
1 MHz
20 MHz
45 MHz
–75 dB
–75 dB
–50 dB
–40 dB
–75 dB
–75 dB
–50 dB
–75 dB
–75 dB
–50 dB
–40 dB
–75 dB
–70 dB
–45 dB
N/A
Capacitance at terminal
block
HI-LO
LO - earth
150 pF
150 pF
250 pF
200 pF
130 pF
120 pF
200 pF
170 pF
100 pF
300 pF
(600 pF 1-wire)
General characteristics
Relay life, typical
No load
10 V, 100 mA
Rated load
100 M
10 M
100 k
100 M
10 M
100 k
1000 M
10 M
10 k
1000 M
10 M
10 k
Unlimited
Unlimited
Unlimited
Scanning speeds
[3]
100 ch/sec 100 ch/sec 500 ch/sec 500 ch/sec 1000 ch/sec
Open/ close time, typical 4 ms/4 ms 4 ms/4 ms 0.5 ms/0.5 ms 0.5 ms/0.5 ms 0.25 ms/0.25 ms
Analog bus backplane
connection
Yes Yes Yes Yes Yes
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