12
Subject to change without notice
2.1 Test Instructions
STOP
Warning:
Do not perform internal service or adjustment
of this product unless another person capable of
rendering fi rst aid and resuscitation is present.
“Do not service alone”
STOP
Warning:
Dangerous voltages exist at several points in this
product. To avoid personal injury, do not touch ex-
posed connections and components while power is
on. “Use care when servicing with power on”
Disconnect power before removing protective panels, soldering
or replacing components.
The following procedures assume that the HM5014-2 is con-
nected to mains/line via a safety class II transformer. Only
qualifi ed personnel who are aware of the danger of electricity
should execute the following procedures. If cables or connec-
tors have to be disconnected, the instrument must be switched
off before the removal.
It is further assumed that the personnel executing the fol-
lowing procedures are acquainted with the operation of the
instruments used and their use. The operation of the HM5014-
2 is described in detail in the user manual downloadable at
the HAMEG website, so it is not repeated here. Only special
commands not included in the user manual are described
as needed.
Note: The instrument must have a 30-minute warmup period
before making any checks or adjustments. Performing the ad-
justment or the checking procedure while the temperature is
drifting may cause erroneous adjustment setting and check re-
sults. During warm-up, the instrument is to be operated inside
the casing. The ambient temperature must be 23°C ±2°.
To ensure proper conditions for the performance check and
prevent settings errors, the instrument must be prepared as
follows:
– Allow a minimum warm-up time of 30 minutes at ambient
temperature (unit must be inside casing)
– Switch off the HM5014-2 and then switch it on again
– Set the HM5014-2 to the following:
– Center frequency 500 MHz
– Span 1000 MHz
– ATT 10 dB
– TG
off
– RBW 1000 kHz
– VBW not activated
– Marker not active
– View
A
– Test signal off
– Average not activated
– Max. HLD not activated
– Intens and Focus set to normal values (trace and readout
visible)
– 5 dB/Div not active
– Ref.-Level –20 dBm
– Instrument in Local mode (LED RM not lit)
2 . P e r f o r m a n c e a n d F u n c t i o n a l T e s t s
2. Performance and Functional Tests
The following sections describe the checking procedures. The
values are specifi ed in the data sheet “Specifi cations”. Additio-
nal introduction of errors caused by the measurement equip-
ment must be taken into account when adjusting the rated va-
lues. All measurements will be performed with an external 10
MHz reference frequency with a minimum accuracy of 1E-9.
2.2 Basic Performance Tests
2.2.1 Check of supply voltages
The supply voltages must be in the intended range for the in-
strument to operate properly. A great variety of malfunctions
may occur in case of incorrect supply voltages.
The 144V, 32V, 12V and –12V supplies can be measured on the
pins of the unused 8 pin molex connector [Photo] as indicated
in table x.x
Figure 2-1: 8pin connector for supply measurement
Pin1 144V
Pin6 32V
Pin7 12V
Pin8 -12V
(In earlier units this connector may have a ribbon cable at-
tached)
The 5 Volt supply voltage can be measured on the CPU-Board
5th pin of the supply voltage connector shown in Fig. 2-1.
+5 V
Figure 2-2: CPU board, showing the location for +5V
measurement.
