Pulse Output [CNT-91(R) only]: User definable to serve as output for built-in pulse generator, gate indicator or alarm.
Optional Main Input Connectors (not with Option 23/90): The front panel inputs can be moved to the rear panel by
means of an optional cable kit. Note that the input capacitance will be higher.
Type Plate: Indicates instrument type and serial number.
Fan: A temp. sensor controls the speed of the fan. Normal bench-top use means low speed, whereas rack-mounting
and/or options may result in higher speed.
Protective Ground Terminal: This is where the protective ground wire is connected inside the instrument. Never
tamper with this screw!
Line Power Inlet: AC 90-265 Vrms, 45-440 Hz, no range switching needed.
Reference Output: 10 MHz derived from the internal or, if present, the external reference.
External Reference Input: Can be automatically selected if a signal is present and approved as timebase source, see
Chapter 9.
External Arming Input: See page 5-7.
GPIB Connector: Address set via User Options Menu.
Ext. DC Connector: Part of Option 23/90 for CNT-90(XL). Range: 12-18 V Note the polarity.
USB Connector: Universal Serial Bus (USB) for data communication with PC.
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