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One of the very rst clocks was a water clock : Water dripped into a cup When the cup was full, it tipped over, spilled its contents, and started over In tipping, it advanced a counter mechanism that indicated the number of times it had tripped and thus the passage of time A digital ammeter is exactly the same, except that it counts electrons instead of water drops The cup is an electrical capacitor As the capacitor collects electrons, the voltage across its terminals increases When the voltage of the capacitor reaches a predetermined level, the capacitor is discharged, and the charging begins again The greater the current ( ow of electrons), the more rapidly the capacitor charges and discharges The charge/discharge cycles are electronically counted, and the number of cycles per second are directly proportional to current The analogy between analog and digital ammeters, voltmeters, ohmmeters, and multimeters is similar Given a digital ammeter, we just add shunts, resistors, batteries, and rotary switches Figure 26 shows a typical digital volt-ohm meter
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Fig 26 Digital Volt-Ohm Meter (DVM)
DIGITAL MULTIMETER
DC V
AC V
CHECK
DC mA
DC MA/K 200 MA MAX
COMMON
DC 1000V AC 750V MAX
DC Measur ements
Digital vs Analog Test Instruments
Digital vs Analog Multimeters
So which is better the analog or digital multimeter Both are available in a range of sizes, from shirt pocket to benchtop, and both can be had for as little as $10 to as much as $400 To help you decide which is better for you, Table 21 lists the speci cations of two typical midpriced units The speci cations use several pre xes: (micro) = 10 6 multiply by 0000001 m (milli) = 10 3 multiply by 0001 k (kilo) = 103 multiply by 1,000 M (mega) = 106 multiply by 1,000,000
Table 21 Typical Analog and Digital Multimeter Speci cations
Digital vs Analog Panel Meters
Ammeters and voltmeters (Figures 27 and 28) are used in distribution and circuit breaker panels to monitor battery voltage and rate of charge/discharge An analog battery charge indicator is simply a voltmeter with its needle pegged at the left until the voltage reaches approximately 8 to 10 volts, thus expanding the scale over the useful voltage of a 12-volt battery Digital panel meters are slowly replacing analog meters They cost no more to produce than the analog variety and are far more accurate, so one hopes their prices will soon drop
Fig 27 Analog Panel Meters
Speci cation DC volts lowest range highest range accuracy1 lowest range highest range accuracy1 lowest range highest range accuracy1 lowest range highest range accuracy1
Analog Multimeter 250 mV 1,000 V 4% 5V 1,000 V 4% 50 A 10 A 3% 2k 20 M 3%
Digital Multimeter 300 mV 1,000 V 02% 3V 750 V 05% 300 mA 10 A 05% 300 30 M 02%
DC Voltmeter
DC VOLTS
DC Ammeter
DC AMPS
AC volts
DC amps
R CH A
G ED
0 50 100 CH ARG ING
DC VOLTS
Battery Charge Indicator
Resistance
Accuracy as percent of full scale
Battery Charge Indicator
DISCHARGED 0
50 100 CHARGING
11 12 13
14 15
BATTERY CONDITION
A glance at an old-fashioned watch gives you a sense of the approximate time very quickly A digital watch, however, rst requires recognition of the numbers displayed, then an interpretation of the signi cance of the numbers The same is true of analog and digital multimeter displays If you wish to know simply whether your battery is charging or discharging (roughly 14 versus 12 volts), the analog meter with 4% accuracy ( 06 volt on a 15-volt scale) will do the job But if you want to know the percentage of charge remaining in your battery, where the same 06 volt represents 50% of battery capacity, you d better use a digital meter with its 02% ( 003 volt on a 15-volt scale) accuracy
Fig 28 Digital Panel Meters
Digital Ammeter
DC AMPS
Digital Voltmeter
DC VOLTS
Digital vs Analog Test Instr uments
Homemade Testers
Most of the wiring problems on a boat are of the go, no-go variety All DC circuits start at the boat s 12-volt battery As you check a suspect circuit farther and farther from the battery, there either is or isn t voltage present At the rst point you nd no voltage present, you can be sure the problem lies between this point and the last point where voltage was present The most common marine wiring problems are due to corrosion of connections and contacts When copper corrodes, it forms green copper oxide an excellent electrical insulator As corrosion progresses, more and more of the contact surface through which current ows is eliminated Eventually, there is so much resistance and voltage drop across the contact that the reduced voltage affects the load If the load is a lamp, for example, the lamp will dim If the load is a motor, the motor will slow down or not start at all There are two simple, do-it-yourself, troubleshooting devices you may end up using more than your fancy multimeter The rst is nothing more than an automotive bulb with attached test leads; the second is a Piezo electric alarm buzzer with test leads
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