HP 120A - Page 3

SPECIFICATIONS
SWEEP
Sweep Range :
l|zsec/cm to at least 0. 5 sec/cm. 15 Calibrated sweeps, accurate to with 
in ±5%, in a 1, 2, 5, 10, . . . sequence, 5gsec/cm to 200 millisec/cm.
Vernier permits continuous adjustment of sweep time between calibrated
steps and extends the 200 millisec/cm step to at least 0. 5 sec/cm.
Sweep Expand:
X5 sweep expansion may be used on all ranges and expands fastest sweep
to lgsec/cm. Expansion is about the center of the CRT and expanded sweep
accuracy is ±10%.
Synchronization :
Internally from vertical deflection signals causing 1/2 cm or more verti 
cal deflection, from line voltage, and from external signals at least 2. 5
volts peak-to-peak.
Trigger Point:
Automatic: Zero crossing, negative slope of external sync signals, zero
crossing, positive or negative slope of vertical deflection signals. Screw 
driver operated control overrides automatic and permits the trigger point
to be set between -10 to + 10 volts. Turning fully counter-clockwise into
auto restores automatic operation.
VERTICAL AMPLIFIER
Bandwidth:
De coupled: de to 200 kc.
Ac coupled: 2 cps to 200 kc.
Bandwidth is independent of sensitivity setting.
Sensitivity:
10 millivolts/cm to 100 volts/cm. 4 calibrated steps accurate within ±5%,
10 mv/cm, 100 mv/cm, 1 v/cm, and 10 v/cm. Vernier permits continuous
adjustment of sensitivity between steps and extends 10 v/cm step to at
least 100 v/cm.
Internal Calibrator:
Calibrating signal automatically connected to vertical amplifier for stand 
ardizing of gain, accuracy ±2%.
Input Connectors:
Banana jacks, spaced 3/4 ” .
Input Impedance:
1 megohm, less than 50g/if shunt.
Balanced Input:
On 10 mv/cm range. Input impedance, 2 megohms shunted by less than
25p/if.
Common Mode Rejection:
Rejection at least 40 db. Common mode signal must not exceed ±3 volts
peak.
Phase Shift;
Vertical and horizontal amplifiers have same phase characteristics within
±2° to 100 kc when verniers are fully clockwise.