Datasheet

Page 18
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Multiplexer Actuator Matrix RF multiplexer Multifunction
DAQM900A DAQM901A DAQM902A
1
DAQM908A DAQM903A DAQM904A DAQM905A DAQM907A
General
Number of channels 20 + 2 20 + 2 16 40 20 4 x 8 Dual 1 x 4 See page 25
for module
specifications
2/4 wire 2/4 wire 2/4 wire 1 wire SPDT 2 wire 50 Ω
Connects to internal DMM
● ● ●
Scanning speed 450 ch/s
80 ch/s 250 ch/s
[1]
100 ch/s
Open/close speed 120/s 120/s 120/s 70/s 120/s 120/s 60/s
Input
Voltage (dc, ac rms)
2
120 V 300 V 300 V 300 V 300 V 300 V 42 V
Current (dc, ac rms) 1 A 1 A 50 mA 1 A 1 A 1 A 0.7 A
Power (W, VA) 50 W 50 W 2 W 50 W 50 W 50 W 20 W
DC characteristics
Offset voltage
3
< 3 uV < 3 uV < 6 uV < 3 uV < 3 uV < 3 uV < 6 uV
Initial closed channel R
3
< 1 Ω < 1 Ω < 1 Ω < 1 Ω < 0.2 Ω < 1 Ω < 0.5 Ω
Isolation ch-ch, ch-earth > 10 GΩ > 10 GΩ > 10 GΩ > 10 GΩ > 10 GΩ > 10 GΩ > 1 GΩ
Risetime 300 ps < 300 ps
Signal delay < 3 ns < 3 ns
Capacitance HI - LO < 50 pF < 50 pF < 50 pF < 50 pF < 10 pF < 50 pF < 20 pF
LO - Earth < 80 pF < 80 pF < 80 pF < 80 pF < 80 pF < 80 pF —
Volt-Hertz limit 10
8
10
8
10
8
10
8
10
8
10
8
10
10
Other
T/C cold junction accuracy
3
(typical) 0.8 °C 0.8 °C 0.8 °C 0.8 °C
8
Switch life No load (typical) 100 M 100 M 100 M 100 M 100 M 5 M
Rated load (typical)
7
100 k 100 k 100 k 100 k 100 k 100 k
Temperature Operating all cards: 0 to 55 °C
all cards: –20 to 70 °C
all cards: 40 °C to 80% RH
Storage
Humidity (non-condensing)
1. Not recommended for connection to ac line without external transient suppression. Up to 250 ch/s to internal memory. See scanning rates for measurement
condition and rate on each instrument.
2. Channel-to-channel or channel-to-earth
3. Errors included in DMM measurement accuracy specifications
4. 50Ωsource,50Ωload
5. Bandwidth direct to card SMB connectors
6. Isolation within channel 1 to 20 or 21 to 40 banks is –40 dB
7. Applies to resistive loads only
8. Thermocouple measurements not recommended with 34908A module due to common lo configuration
Modules specifications
The Keysight DAQ970A accuracy specifications already include
the switching offset and reference junction errors shown below.
These errors are listed separately for determining system error
with external measurement devices.
Up to three modules, in any combination, can be inserted into
a single mainframe. The DAQ970A’s internal DMM connections
are accessible only through the 34901A, 34902A, and 34908A
low-frequency multiplexers.
On-module screw terminals accept wire sizes from
16 gage to 22 gage. Twenty-gage wire is recommended for high
channel count applications. The 34905A and 34906A RF Multi-
plexers use SMB connectors. A standard set of (10) BNC-to-SMB
adapter cables is provided with each
RF module for convenient BNC connections.