Keysight Technologies DAQ970A, Технический обзор

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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 20 + 2 16 40 20 4 x 8 Dual 1 x 4 See page 23
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 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
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: –40 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
Modules characteristics
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 DAQM900A, DAQM901A,
DAQM902A, and DAQM908A 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 DAQM905A RF Multiplexer uses SMB
connectors. A standard set of (10) BNC-to-SMB adapter cables is
provided with each RF module for convenient BNC connections.
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