710 Quad 1-kV Bias Supply
- Bias voltage for solid-state, charged-particle detectors
- Four supplies, with independently selectable polarity and voltage from 0
to ±100 V and from 0 to ±1 kV
- Automatic shutdown if the detector current exceeds 20 µA
- Detector protection in case of vacuum failure
- Alarm output for stopping data collection if a detector or vacuum failure
occurs
- LED display for convenient digital readout of the current or voltage of
any supply
The Model 710 Quad 1-kV Bias Supply contains
four high-voltage power supplies that have independently selectable output voltages and
polarities. Each supply can deliver an output voltage that is continuously adjustable over
the range from 0 to ±100 V or from 0 to ±1 kV, with a maximum output current of 20 µA.
The Model 710 is ideal for providing the bias voltage for solid-state, charged-particle
detectors. It can also be used with ionization chambers and proportional counters that
operate within the range of voltage and current delivered by the Model 710.
On each supply, a 10-turn, locking dial
adjusts the output voltage with a control resolution of 0.05% of full scale. Feedback
regulation ensures an output voltage accuracy within ±0.25% of full scale. The output
voltage or output current of any of the four supplies can be selected for monitoring on
the 3-1/2-digit LED display. This is useful when initially determining the correct bias
voltage for a solid-state detector. Detector bias currents from 0.01 to 19.99 µA can be
measured with a 0.01-µA resolution.
On each supply, a three-position, locking
toggle switch selects the 1-kV or the 100-V range of output voltage, or disables operation
of that supply. The outputs of all active supplies are also controlled by the MASTER
ON/OFF switch. A red LED on each supply indicates when its bias voltage is turned on.
Several features are incorporated to protect
the detectors served by the Model 710, and to ensure the integrity of the data they are
collecting. Green LEDs indicate the polarity of the output voltage for each supply
whenever the bin power is on, and the output polarity selection jumpers are mounted on the
printed circuit board. If the detector current exceeds 20 µA, the bias voltage for that
detector turns off, and the yellow overload LED turns on to indicate a shutdown condition.
That particular channel remains shut down until the fault is cleared and the OVERLOAD
RESET button is pushed. To protect the detectors and their associated preamplifiers
against discharges in a partial vacuum, the vacuum shutdown feature can be utilized. A
relay closure to ground, or a low TTL signal from a trip level on a vacuum gauge can be
applied to the VACUUM SHUTDOWN input to turn off all bias supplies in the case of a vacuum
failure in the detector vacuum chamber. A yellow, front-panel LED turns on to indicate
that the vacuum shutdown has been activated. The rear-panel overload/shutdown alarm output
generates a low TTL level whenever an overload or vacuum shutdown has occurred in the
Model 710. This output can be connected to a computer, or other suitable alarm, to stop
the measurement and prevent the collection of faulty data. The overload/shutdown alarm
outputs from a number of Model 710 modules can be connected together to generate a common
alarm signal.
ORDERING INFORMATION
| Model |
|
Description |
| 710 |
|
Quad 1-kV Bias Supply |
| C-24-12 |
|
RG-62A/U 93-W Cable with two BNC
male plugs; 12-ft length |
| C-36-12 |
|
RG-59A/U 75-W Cable with two SHV female plugs; 12-ft length |
|
