CHAPTER 4 ■ DIGITAL MULTIMETERA pair of hooks can be more perilous in that the multimeter becomes physically attached to the circuit
or test points. The hooks make it more difficult to suddenly withdraw the leads in the event of high voltage or
other error.
On the other hand, a single hook connected to ground can actually be safer than no hooks at all. This
allows the technician to hold only a single, hookless probe, making a pathway across the heart less inviting
and allowing the technician to concentrate on a single point.
Because hook probes are referred to extensively throughout this book, it would be more efficient for
you to purchase a pair of slip-on adaptors (see Table 4-1). However, you can simply swap probes rather than
using an adaptor.
Table 4-1. Test Hook Adaptors
Supplier Part Number Price Color
MPJA.com 27161-MI $0.50 1 red
MPJA.com 27163-MI $0.50 1 black
Figure 4-16. An inexpensive digital multimeter
Comparing Actual Multimeters
Described in this section are various advertised specifications for three digital multimeters. Don’t expect to
buy these exact models, because multimeter part numbers and branding are constantly changing. Instead,
try to understand the specifications so that you can find an existing model that meets your needs.
I’ve deciphered the jargon and analyzed an inexpensive model, a moderately priced model, and a
higher-end model. See if you can guess the prices for them.
Understanding the Features of a Low-End Multimeter
Figure 4-16 shows the absolutely cheapest meter I could find, the DT-830B. It appears to have several
siblings with slightly rearranged cases and model numbers.