I s s u e 6 ( February 2 0 0 5 )
Technical Ser vice Manual
S m i t h s M e d i c a l
5 — 6
M S 1 6 A S y r i n g e D r i v e r
5
To measure the motor interval time, a conventional scope with a good
trigger is required; a storage scope would be better. Using the
variable power supply, place a 4R7 ohm resistor in the negative
supply line, and with a x10 scope probe, measure the voltage across
the resistor.
Run the pump at maximum rate and compare each consecutive pulse
over six pulses.
Figure 5-3
illustrates the typical waveform expected.
The motor run time is measured from the start of the plateau to the
trailing edge of the waveform, where it is cut off by the cam’s action.
Vo
lts
0.00
0.05
0.10
0.15
0.20
0.25
0.30
0.35
0.40
0.45
0.50
0.55
0.60
0.65
Time (seconds)
Cam Period
Cam Period
0.16
0.14
0.12
0.10
0.08
0.06
0.04
0.02
0
MS16 Motor Pulses
GM0105_8044-GB-B
Figure 5-3 Typical waveform for one pulse
The variation in duration of the six consecutive pulses in each
revolution should not be more than 20%. If necessary, adjust the
motor run-time ratio by a slight bending of the cam follower lever,
using tool
part number 0105-0079
. Use the tool as shown in
Figure 5-4
to tweak the operating lever so as to mimimise the error.
Note that the time interval between successive pulses may vary
slightly. This is not a controlled parameter, and variation is
permitted.
SM0105-5-6.PMD
2/23/2005, 3:07 PM
6
Summary of Contents for Graseby MS16A
Page 13: ...1 Graseby MS16A Syringe Driver Chapter 1 Product Overview SM0105 1 6 PMD 2 23 2005 2 54 PM 1 ...
Page 50: ...6 Graseby MS16A Syringe Driver Chapter 6 Maintenance SM0105 6 6 PMD 2 23 2005 3 03 PM 1 ...
Page 55: ...7 Graseby MS16A Syringe Driver Chapter 7 Parts List SM0105 7 6 PMD 2 23 2005 2 59 PM 1 ...
