NI PXI-2527 Specifications
2
ni.com
Differential thermal EMF
Typical
*
.......................................2.5
μ
V
Maximum....................................<12
μ
V
Channel-to-channel DC leakage......500 G
Ω
@ 300 V
Bandwidth (–3 dB, 50
Ω
termination)
1-wire ..........................................>30 MHz
2-wire ..........................................>25 MHz
Channel-to-channel isolation (50
Ω
termination)
(1-wire and 2-wire)
10 kHz.........................................>80 dB
100 kHz.......................................>60 dB
1 MHz .........................................>40 dB
Open channel isolation (50
Ω
termination)
(1-wire and 2-wire)
10 kHz.........................................>80 dB
100 kHz.......................................>60 dB
1 MHz .........................................>40 dB
Dynamic Characteristics
Relay operate time
Typical ........................................1 ms
Maximum....................................3.4 ms
Note
Certain applications may require additional
time for proper settling. Refer to the
NI Switches
Help
for information about including additional
settling time.
Maximum scan rate .........................120 channels/s
Expected relay life
Mechanical..................................1
×
10
8
cycles
Electrical
<30 mV, <10 mA ...................2.5
×
10
6
cycles
30 VDC, 2 ADC resistive.......1
×
10
5
cycles
300 VDC,
60 mADC resistive .................5
×
10
5
cycles
Note
The relays used in the NI PXI-2527 are
field replaceable. Refer to the
NI Switches Help
for information about replacing a failed relay.
Trigger Characteristics
Input trigger
Sources ....................................... PXI trigger lines 0–7
Minimum pulse width ................ 150 ns
Note
The NI PXI-2527 recognizes trigger pulse
widths less than 150 ns by disabling digital filtering.
Refer to the
NI Switches Help
for information about
disabling digital filtering.
Output trigger
Destinations ................................ PXI trigger lines 0–7
Pulse width ................................. Programmable
(1
μ
s to 62
μ
s)
Thermocouple Measurement
You can use the NI PXI-2527 and the NI TB-2627 to measure
thermocouples. NI software can convert a thermocouple
voltage to the thermocouple temperature. For example code,
visit
ni.com/zone
, click the Example Code link in the
navigation bar, and enter
PXI-2527
in the Search field.
When measuring thermocouples, be sure to account for error
in your measurements. The total error in thermocouple
measurement is the sum of the system error (determined by the
thermal EMF of the NI PXI-2527 and the CJC temperature of
the NI TB-2627) and the thermocouple error (determined by
the type of thermocouple used).
*
To ensure the typical thermal EMF, power down all relays and avoid pulsing high currents near the channels you are measuring.
