Tektronix 494AP Speclfication- 494Al4g4ApService,Vol, J104 ACCESSORy Pin4 Pin5, UalrbratorcAL ouT

Speclfication- 494Al4g4ApService,Vol. 1

Table2-3(Continued)

INPUTSIGNALCHARACTERISTICS

Characteristic

SupplementalInformation

J104 ACCESSORy(Continued) Pin4

Pin5

Pins6 - 13a

P i n 1 4 a

P i n 1 5

P i n 1 6 a

Pin 17

Pins18-25

InternalControl.

High(default)selectsinternalcontrol. lnstrumentbus lines are output at theJ104ACCESSORyconnector.

Low selectsExternalcontrol.lnstru- ment bus linesat the J104AccES- SORY connectoraccept input from an externalcontroller.

ChassisGround

InstrumentBus Address lines7-0a

InstrumentBus DataValidsignala

InstrumentBus ServiceRequestsig- nal

InstrumentBus Poll signala

Data Bus Enable input signal for externalcontroller.

High (unasserted)disables external data bus.

Low enablesexternaldata bus.

InstrumentBus Datalines0-7

Active when external Data Bus Enable(pin17)is low.

soutput when internally controlled {pin 4 high) and input when externally controled (pin 4 low).

Table 2-4

OUTPUTSIGNALCHARACTERISTICS

Characteristic Performance Requirement

ualrbrator(cAL ouT) - 20 dBm *0 . 3 dB at 100 MHz

1st LO and 2nd LO OUTpUTs

1stLO OUTPUTpower

2nd LO OUTPUT power

aover lhe operating temperature range this is +15 ppM.

SupplementalInlormation

100 MHz comb of markers provide amplitudecalibrationat-100 MHz

Phaselockedto referenceoscillator

Provide access to the output of the respective local oscillators

THESE PORTS MUST BE TER- MINATEDIN 50 O AT ALL TIMES.

+7 . 5dBmto +15dBm

- 1 2 d B m . * 5 d B

2-13