General Characteristics

Front Panel Connectors

8753ES test ports (without Option 011)

Connector type	7 mm, precision
Impedance	50 ohms (nominal)
8753ES Option 011 test ports
Connector type	Type-N female
Impedance	50 ohms (nominal)
8753ES Option 075 test ports
Connector type	Type-N female
Impedance	75 ohms (nominal)
8753ET test ports
Connector type	Type-N female
Impedance	50 ohms (nominal)

Probe power

+15V ±2% 400 mA

(combined load for both probe connections) -12.6V ±5.5% 300 mA

(combined load for both probe connections)

Rear-Panel Connectors

External reference frequency input (EXT REF INPUT)

Frequency	1, 2, 5, and 10 MHz
	(±200 Hz at 10 MHz)
Level	-10 dBm to +20 dBm, typical
Impedance	50 ohms
Connector	BNC (f)

High-stability frequency reference output (Option 1D5)

Frequency	10.0000 MHz
Frequency stability	±0.05 ppm
(0° to 55° C)
Daily aging rate	<3x10–9/day
(after 30 days)
Yearly aging rate	0.5 ppm/year
Output	0 dBm minimum
Nominal output impedance	50 Ω Connector BNC (f)
External auxiliary input (AUX INPUT)
Input voltage limits	-10V to +10V

External AM input (EXT AM)

±1 volt into a 5 k Ω resistor, 1 kHz maximum,

resulting in approximately 8 dB/volt amplitude modulation. BNC (f) connector.

External trigger (EXT TRIGGER)

Triggers on a negative TTL transition or contact closure to ground. BNC (f) connector.

Test sequence output (TEST SEQ)

By default, this connector outputs a TTL end-of- sweep signal. It can also be programmed by the user in a test sequence to output a user-defined TTL signal. BNC (f) connector.

Limit test output (LIMIT TEST)

This connector outputs a TTL signal of the limit test results. Pass: TTL high. Fail: TTL low. BNC (f) connector.

Test-port bias input (BIAS CONNECT) (8753ES only)

Maximum voltage	+30 VDC
Maximum current	±200 mA
(no degradation in RF specs)
Maximum current	±1 A
Connector	BNC (f)

VGA video output (EXT MON)

This connector drives external VGA monitors.

GPIB

This connector allows communications with compatible devices including external controllers, printers, plotters, disk drives, and power meters.

Parallel port

This 25-pin female connector is used with parallel peripherals. It can also be used as a general purpose I/O port.

RS-232C

This 9-pin male connector is used with serial peripherals.

DIN keyboard

This mini-DIN connector is used for adding an IBM PC-AT compatible keyboard.

Test set interconnect

This connector is used to connect an 8753ES Option 011 to the 85046A/B or 85047A test set. 8753ES analyzers without Option 011 can use signal levels on this connector for sequencing or general purpose I/O applications.

Internal memory

Typical data retention time with 3V, 1.2 Ah battery:

At 25° C	11,904 days (32.6 years)
At 40° C	1244 days (3.4 years)
At 70° C	250 days (0.68 year)

Line power

48 Hz to 66 Hz

115V nominal (90V to 132V) or 230V nominal (198V to 264V). 280 VA max.