Lake Shore 372, Руководство пользователя, Страница: 30 / 214

18 c
HAPTER
1: Introduction
Model 372 AC Resistance Bridge and Temperature Controller
Heater offset (at 0%) ±0.02% of range
Heater gain accuracy ±1% of setting
Heater noise <0.005% of range
Isolation Isolated from chassis ground, measurement and
control inputs; shared ground with analog/still
output
Heater connector Detachable terminal block
Safety limits Curve temperature, power up heater off, shunted
with a relay on power up, short-circuit protection,
compliance voltage limit detection, input
temperature limit
Additional software features Heater power display based on user entered
resistance
1.8.5 Warm-up Heater
Output Type Variable DC current source
Control modes Closed loop PID, PID zones, open loop, warm-up
mode
Setpoint units
)
, K (with temperature curve)
D/A resolution 16-bit
Resistance range 10
)
to 100
)
Isolation Chassis ground reference when on. Shunted and
isolated when off.
Heater connector Detachable terminal block
Safety limits Curve temperature, power up heater off, shunted
with a relay on power up, short-circuit protection,
compliance voltage limit, relay disconnects output
when off, input temperature limit
1.8.6 Analog/Still
Output Type Variable DC voltage source
Control modes Open loop, still heater, monitor output
Isolation Isolated from chassis ground, measurement and
control inputs; shared ground with sample heater
Output voltage range ±10 V
Maximum current 100 mA
Maximum power 1 W into 100
)
Minimum load resistance 100
)
(short-circuit protected)
Accuracy ±2.5 mV
Noise (resolution) <0.003% of range
Monitor output settings
Scale User selected
Data source Temperature or sensor units
Settings Input, source, top of scale, and bottom of scale
Connector Detachable terminal block
25
)
setting 50
)
setting
Maximum power 10 W 10 W
Maximum current 0.63 A 0.45 A
Voltage compliance (min) +15.8 V +22.4 V
Heater load for maximum power 25
)
50
)