HP 333A Operating And Service Manual page 4

Section I
Model 333A/334A
Table 1-1. Specifications (Cont'd)
Distortion Introduced by Instrument:
> -70 АВ from 5 Hz to 200 kHz
> -64 dB from 200 kHz to 600 kHz
Meter indication is proportional to the aver-
age value of a waveform.
FREQUENCY CALIBRATION ACCURACY
Better than +5% from 5 Hz to 300 kHz
Better than: 1096 from 300 kHz to 600 kHz
INPUT IMPEDANCE
Distortion Mode: 1 МО +5% shunted by «70 pF.
Voltmeter Mode:
1 МО +5% shunted by «30 pF (333A only),
1 MQ +5% shunted by «35 pF (334A only),
1 to 300 V ranges; 1 МО +5% shunted by «70 pF,
300 u V to 0.3 V ranges.
INPUT LEVEL FOR DISTORTION MEASUREMENTS
0.3 V rms for 100% set level (up to 300 V may
be attenuated to set level reference). The
minimum measurable distortion for floating
operation on the X1 frequency range is 50dB
below the fundamental.
DC ISOLATION
Signal ground may be +400 Vdc from external
chassis,
VOLTMETER RANGE
300 рУ to 300 V rms full scale (13 ranges),
10 dB per range.
VOLTMETER FREQUENCY RANGE
5 Hz to 3 MHz (300 uV range: 20 Hz-500 kHz).
VOLTMETER ACCURACY:
20 Hz-500 kHz
5 Hz-3 MHz
5 Hz-500 kHz
30 Hz-300 kHz
lmV-30V 1 10 Hz-i MHz
100 V-300 V | 10 Hz-300 kHz
300 ру
MODEL 334A
Same as Model 333A except as indicated below:
AM DETECTOR
High impedance dc restoring peak detector with
semi-conductor diode operates from 550kHz to
greater than 65 MHz. Broadband input.
Maximum input; 40 V p-p ac or 40 V peak
transient.
. CARRIER FREQUENCY
550kHzto 1.6 MHz: Distortion introduced by
detector is « 0. 3% for 3 to 8 volt carriers
modulated 30%.
i-2
NOISE MEASUREMENTS
Voltmeter residual noise on the 300 pV range:
« 25 u V rms terminated in shielded 6000; «30
u V rms terminated in shielded 100 КО.
OUTPUT
For input frequencies from 20 Hz to 600 kHz,
0.1 V rms + 0.01 V open circuit for full scale
meter deflection; 0,05 V rms + 0.005 V into
2 КО for full scale meter deflection.
AUTOMATIC NULLING MODE
Set Level: At least 0,2 V rms.
Frequency Ranges:
X1, manual null tuned to less than 3% of set
level; total frequency hold-in +0. 5% about
true manual null.
X10 through ХОК, manual null tuned to
less than 1090 of set level;totalfrequency
hold-in +1% about true manual null,
AUTOMATIC NULL ACCURACY
5 Hz to 100 Hz: Meter reading within 0 to +3
dB of manual null.
100 Hz to 600 kHz: Meter reading within 0 to
+1.5 dB of manual null.
HIGH-PASS FILTER
3 dB point at 400 Hz with 18 dB per octave roli
off. 60 Hz rejection > 40 dB. Normally used
only with fundamental frequencies greater than
1 kHz.
POWER SUPPLY
100 v/120 V/220 V/240 V + 5% = 10%, 48 -
66 Hz, approximately 4 watts.
1.6 MHz to 65 MHz: Distortion introduced by
detector is < 1% for 3 to 8 volts rms carriers
modulated 30%.
NOTE
Distortion measurement at carrier levels
as low as i volt may be made with reduced
accuracy.
OPTION: 01
Indicating meter has VU characteristics con-
forming to FCC Requirements for AM, FM,
and TV broadcasting.