HP 415E User Manual

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Model 415Е
Section V
Paragraphs 5-1to 5-11
SECTION V
MAINTENANCE
5-1. INTRODUCTION.
5-2. This section provides instructions for perfor-
mance testing, calibrating, troubleshooting, and re-
pairing the SWR Meter.
5-3. PERFORMANCE TESTING.
5-4. PURPOSE. The procedures listed in Table 5-2
check 415E performance for incoming inspection,
periodic evaluation, calibration, and troubleshooting.
Тре tests can be performed without access to the in-
Strument interior. Тһе specifications of Table 1-1
are the performance standards.
5-5. TEST EQUIPMENT REQUIRED. The test in-
struments and accessories required to make the per-
formance checks arelisted in Table 5-1. Test instru-
ments other than the ones listed can be used provided
their performance equals or exceeds the Minimum
Required Specifications.
5-6. ISOLATING ATTENUATOR. Іп order to obtain
accurate results when checking the Model 415E, it is
necessary to maintain some attenuation between the
Source and the INPUT to compensate for a source im-
pedance different from the calibrated attenuator used.
The attenuator recommended for test and adjustment
and performance testing hasan impedance of 50 ohms.
Therefore, a5 to 10 db, 50 ohmattenuator is suggested
to be placed between the Oscillator and theattenuators
used in the test setup (Table 5-2). If a separate atten-
uatoris notused, then one of the Model 355 Attenuators
may be left in the setup set to 5 or 10 db, or use an
impedance matching transformer.
5-7. CALIBRATION.
5-8. GENERAL.
5-9. Тһе following procedures outline the adjustments
necessary to calibrate the Model 415E. The actual
adjustments shouldbe madeonly whenit is determined
that the instrument is not operating properly. To de-
termine proper performance, see Table 5-2. If the
instrument fails to meet any of the given limits or in-
dications, refer to the troubleshooting paragraph 5-35
for possible causes and corrective action. This pro-
cedure is sequential to some extent. Тһе bias sup-
plies should be set before any attempt to adjust the am-
plifier. Also check the mechanical meter adjustment
before checking any indication on the Model 4155
meter.
Note
To avoid errors due to possible groundloop
currents isolate the Model 415E from ground
used for other measuring instruments. It may
be necessary to use adapters to unground all
instruments except the Model 415E.
5-10, MECHANICAL METER ADJUSTMENT.
5-11. When the meter is properly set, the pointer
rests over the calibration (i.e., 2 on the 0 to 2 DB
scale) on the meter scale when the instrument is (1)
at normal operating temperature, (2) in its normal
operating position, and (3) turned off. Set the pointer
as follows to obtain best accuracy and mechanical
stability:
Note
If meter pointer adjustment is changed, ЕХ-
PAND tracking (Paragraph 5-16) must be
checked and adjusted if necessary.
a. Turn instrument off.
р. Rotate mechanical zero-adjustment screw clock-
wise until meter pointer is to left of 2 (on the 0 to 2
DB scale) and moving to the right toward 2.
c. Continue to rotate adjustment screw clockwise;
stop when the pointer is exactly on 2. If the pointer
overshoots 2, repeat steps b and c.
Table 5-1. Recommended Test Equipment
a а = --
Accuracy: +3%
Distortion: less than 1%
Instrument Minimum Required Recommended
Type Specifications | USE/Check | Моде1 |
| i |
Audio Oscillator | Freq. Range: 400 to 2500 срв All Performance hp 200CD
Output: 10 volts into 600 ohms
Tests
Electronic Егед. Range: 400 to 2500 cps Frequency, and hp 5512A (or
Counter Accuracy: +1 count «0. 01% Bandwidth 5212A)
i
AC Voitmeter Voltage Range: 0.1to 1 volt | Sensitivity, and hp 400H і
Accuracy: +1% of full scale Noise
Freq. Range: 400 to 2500 cps
Input impedance: 10 megohms
02152-2
5-1

HP 415E Specifications

General

Brand	HP
Model	415E
Category	Measuring Instruments
Language	English