Metek EX1200A SERIES, Руководство пользователя

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VTI Instruments Corp.
96 EX1200A Triggering
Connecting a frequency signal via the EX1200A DMM bus requires a making connections similar
to those used for voltage measurements.
DMM Backplane
B
P
L
_
H
I
B
P
L
_
L
O
B
P
L
_
S
H
I
B
P
L
_
S
L
O
CH 1
CH 2
CH n
Frequency Sources
EX1200
Multiplexer Cards
EX1200 Mainframe
T
ABLE
4-9: F
REQUENCY
M
EASUREMENT
C
ONNECTIONS VIA
EX1200A DMM B
US
T
EMPERATURE
M
EASUREMENTS
EX1200A’s internal DMM can make temperature measurements by connecting sensors to its
inputs. By doing so, it can be used as a high-channel count data logger. Three categories of
sensors are supported: thermocouples, RTDs (resistance temperature devices), and thermistors.
Table 4-10 indicates each category and the types of sensors supported by the EX1200A DMM.
Category Built-in Sensor Support Custom Sensor Support
Thermocouple
B, E, J, K, N, R, S, T Cannot be defined at the instrument level.
RTD
PT100, D100, F100, PT385, PT3916 R
0
(reference temperature)
α (or “A”)
β (or “B”)
δ (or “delta”)
Thermistor
2.2 kΩ, 5 kΩ, 10 kΩ A, B, C (curve fitting constants
T
ABLE
4-10: S
UPPORTED
T
EMPERATURE
S
ENSORS
NOTE Temperature measurement values are returned in degrees Celsius (°C) and cannot be configured
for Fahrenheit (°F) or Kelvin (K).
Configuring Temperature Measurements
Temperature measurements require the following information to be properly configured.
Input
As with other measurement functions, the DMM’s input can be routed from the external front
panel or via the internal DMM bus. If the thermocouples are being connected to switch cards with
DMM access, then internal input mode should be selected.