Appendix A: Specifications
A-4 370B User Manual
Table A-1: Collector Supply (Cont.)
Characteristic Operating InformationPerformance Requirement
Sweep start Voltage Accuracy
Applicable to "FULL WAVE mode. Due to
stray capacitance between collector and
ground terminals, zeroĆvoltĆerror may occur
because of charged offset voltage.
16, 80, 400 V range
"2 % of MAX Peak Voltage
2000 V Range
"15 % of MAX Peak Voltage
Thermal cutoff (typical)
Operating Temperature
70_C, "2.8_C
For Collector Supply Amplifier and Series
Resistors.
Current limit
Operating Point At least 2.0 A, 1.2 A and 0.2 A of primary
current of collector transformer.
Depends on Vertical and Max Peak Volts
settings.
Voltage limit
Operating Point 50%,25%,5%ofMaxPeak Volts Depends on Horizontal and Max Peak Volts
settings.
Arc Killer Collector supply is disabled at least one cycle
while the relays or switches are operated.
Output Control Circuit Breaker mounted on the front panel
enables and disables Collector supply,Step
Generator and AUX source.
No trip for 1.5 A of Collector Transformer
primary current. (100 % rating of circuit
breaker)
Trip occurs between 3 second and 80 second
for 2.025 A of Collector Transformer primary
current. (135 % rating of circuit breaker)
. The collector supply is limited to a maximum continuous peak current operating time under the following duty cycle and
ambient temperature conditions:
50 W. Maximum continuous operating time at rated current (100 % duty cycle) into a short circuit is 20 minutes at 25_C
ambient, or 10 minutes at 40_C ambient.
220W. Maximum continuous operating time at rated current(, 100 % duty cycle) into a short circuit is 3 minutes at 25_C
ambient, or 90 seconds at 40_C ambient.
Alternatively, the duty cycle may be limited to 50 % at 25_C ambient or 25% at 40_C ambient. (A normal family of transistor
curves will produce a duty cycle effect to 50 % or less, even if operated continuously.)
Collector Supply over-dissipation temporarily shuts off the power, and prints a message on the screen. Collector Supply
over-current trips the OUTPUTS breaker, prints a message on the screen, and reset the Collector Supply output to 0 %. No
damage results when over-dissipation occurs.
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