HP AM-4380/U 5261A Page 8 Technical Manual Download

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Model 5261A

Section I

Paragraphs 1-1 to 1-9

SECTION I

GENERAL INFORMATION

1-1. INTRODUCTION.
1-2. DESCRIPTION.

1-3. The Hewlett-Packard Model 5261A Video
Amplifier is a plug-in unit which increases the sensitivity
of the Model 52431,, 52451I, and 5: 345A Electronic
Counters. The Model 5261A provides for measurement
of signals as low as 1 millivolt over the frequency range
of 10 cps to 20 Me (52431) or 50) Mc (52451,). The
input impedance is I megohm and may be increased to
1(0 megohms by using a 10: 1 divider probe (HP stock
no. I000: 3A) An output signal is available at the
OUTPITT 50-ohm connector for monitoring the Video
Amplifier output or for activating external instruments.
This signal is identical in frequency and amplitude to the
amplified signal supplied to the counter input circuit.

1-4. INSTRUMENT II)ENTIFICATION.

1-5. Hewlett-Packard uses a two-section serial
number mounted on the rear panel. Earlier instruments
use an eight-digit serial number (000-00000). The first
three digits are a serial prefix number; the last five digits
refer to the specific instrument. Later instruments use a
nine-digit serial number (0000A00000).The first four
digits are the serial instrument. If the serial prefix on your
instrument does not appear on the title page of this
manual, there may be differences between the manual

and your instrument. If there are differences, they will
be described in a change sheet included with the manual.

1-6. ACCESSORY SUPPLIED.

1-7. A 50 ohm, low microphonic cable HP
10507fi001, with BNC connectors is supplied in the
package with the Model 5261A.

1-8. ACCESSORIES AVAILABLE.

1-9. Table 1-2 lists the accessories available for the
Model 5261ilA Video Amplifier.

TABLE 1-2. Accessories Available

Description

HP Stock No.

10:1 divider probe, 10 pf shunt

10003A

600V max., dc to 40 Mc

50-ohm feed-through termination 10100A

50-conductor extender cable 10506C

Plug-in adapter (for use with 5345A) 10509A

prefix and the last five digits refer to the specific

TABLE 1-1. Specifications*

BANDWIDTH: 50 OHM OUTTPUT:

10 cps to 50 Mc with 5245I,; 10 cps to 20 Mc Separate BNC front panel output for oscillo-
with 5243I,. scope monitoring or for driving external equip-

INPUT SENSITIVITY: ment; 50-ohm source impedance. On ampli-

1 mV to 300 mV rms. fier’s most sensitive attenuator range, 1 mV

rms at input results in at least 100 mV rms at

INPUT IMPEDANCE: auxiliary output into 50-ohm load. Maximum

Approximately I megohm, 15 pf shunt; undistorted output is 300 mV rms into 50-ohm
HP 10003A Probe increases impedance to 10 load.
megohms, 10 pf shunt.

ATTENUATOR RANGES: ACCESSORY FURNISHED:

1, 3, 10, :30, and 100 mV rms. HP 100I 3A 10:1 Probe, 10 pf shunt, 600 volts

maximum; HP 10100A 50-ohm Feed-thru

MAXIMUM INPUT Termination, 10506B Extender Cable, 10590A
100 volts dc, 5 volts rms (ranges: 1, 3, 10, Plug-In Adapter.
30, 100 mV).

MONITOR: WEIGHT:

Meter shows when the signal level is accept- Net 2 lbs (0,90 kg); shipping 8 lbs (3,8 kg).
able to the counter.

ACCURACY: POWER:

Retains accuracy of 5243L, 5245L, or 5345A Supplied by 5243I,, 5245L, or 5345A Electronic
Electronic Counters. Counters.

*When installed in the HP Model 5243L, 5245L, or 5345A Electronic Counters.

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